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> using internal smart pointer types that map 1-to-1 to Rust equivalents

Smart pointers weren't invented by Rust. If you write code in other languages with pointers you mentally model the same types already.

> and `bun_collections` Rust crate already exists.

This is wrong. It's part of the PR in the codebase. It did not previously exist.

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Agree, after closer look smart pointer types are pretty standard and collections were indeed a part of migration.

But still, in order to prepare those detailed and very project-specific instructions you need to iterate on trying to convert the files from this specific codebase.

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